Irrigation control apparatus responsive to soil moisture

Details Irrigation control apparatus responsive to soil moisture Irrigation control apparatus responsive to soil moisture

1991-10-29

1992-09-22

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

With cutoff or flow varying means operated by means...

With overriding second control means

239 70, A01G 2516

Patent

active

051489856

ABSTRACT:
An improved irrigation control apparatus for use in controlling an irrigation valve. The apparatus includes a soil moisture sensor for generating an output signal indicative of the soil moisture level. The output signal is sent to a control unit that inhibits valve operation if the soil is considered wet. The control unit has a control circuit that applies a relatively short duration power pulse to the sensor to obtain a moisture reading during the pulse. In addition, the control unit includes display lights which are part of a manually actuable test circuit that displays a wet or dry soil indication received from the sensor.

REFERENCES:
patent: 3238392 (1966-03-01), Richards
patent: 3361356 (1968-01-01), Johnson et al.
patent: 3991375 (1976-11-01), Riggs et al.
patent: 4657039 (1987-04-01), Bireley et al.
patent: 4718446 (1988-01-01), Simpson
patent: 4796654 (1989-01-01), Simpson
patent: 4892113 (1990-01-01), Fattahi
patent: 4936333 (1990-06-01), Bireley

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